SPOILER ALERT: Don't read on if you haven't seen last Saturday's episodes

We'll be launching a (belated) series blog for The Killing this Saturday, to discuss every little twist as the drama heads towards its conclusion. But first, it seems sensible to note what Sarah Lund and Jan Meyer have already sleuthed out, remind ourselves which questions still need answering and throw a few theories out there. If only so they are immediately disproved by events in the next episode. (See the recent blog in which I wrote about how Hartmann was the only one I trusted. Hmmm.)

This would be a long blogpost indeed if I was to try and round up more than 10 hours of detecting, so I haven't gone back over ground in earlier episodes. If you're not up to date with the series, you should stop reading now and head over to iPlayer, given that there are massive spoilers below. Everyone else: I'll have to leave the Danish pronunciation to your imaginations.

The investigation: what do we know?

• Nanna Birk Larsen had a key to the party's flat on Store Kongensgade, which was where she was raped.

• Troels Hartmann is on security camera driving the car that Nanna was later found in. He has also admitted to being at the flat that evening – but claims to have left at 11pm and gone over to see Rie Skovgaard, before spending the next day with her at a conference.

• Nanna was working at a private nightclub, and for a time dating a man she met on the club's dating site who used the name Faust.

• Nethe Stjernfeldt confirms that Faust is Hartmann, and Lund and Meyer find emails from Faust to Nanna that were sent from the computer in the Store Kongensgade flat.

• Hartmann claims someone stole his password, which is ludicrously easy to guess and the same for everything. (Bangs head on desk.)

• Skovgaard eventually admits that Troels didn't come over, and wasn't at the conference either. Now he has no alibi.

• Nethe Stjernfeldt saw a man in the window of the flat at midnight – but, she says, he was shorter than Hartmann.

The family

Theis might be home, but Pernille is less than pleased to see him now she knows he kept Nanna's job from her – he has to talk her into not leaving him. Pernille seems to be growing evermore brittle, retreating into herself yet further, fixated on the killer at the expense of even her relationship with the boys. She swerves the car dangerously when they won't stop arguing, and now has decided to co-operate with the sweet-talking journalist. (I say nothing). She's teetering on the edge.

The politicians

Hartmann is just about keeping the alliance together and Bremer at bay – but it's by no means clear that will continue to be the case, particularly as Rie has wavered in her protection of him.

Questions

So many, but for now:

• What's going on with Lund's flat? The sabotaged light, the door ajar? And who do we think she is making feel uncomfortable?

• Even allowing for a more relaxed Scandinavian attitude, would Troels really have been dating so many women he met through the dating site in an election year?

• Exactly how significant was the Hartmann/Lund exchange about the lift. Does that cast doubt on everything he says?

• Where are we with Olaf Christensen? All those bookings at the flat, but he has an alibi for the evening. But presumably he could have been booking the flat for someone else …

• Any thoughts about Lennart Brix? Aside from the fact he looks a little bit like Hartmann. (If you haven't got your specs on.)

Observations

• I'm not sure I found Theis and Kemal's meeting an adequate payoff for such an explosive storyline. I don't think we needed redemption (quite the opposite) but perhaps something with a bit more weight.

• I'm very much enjoying Lund and Meyer's reinvigorated working relationship – and also Meyer taking a more equal role. Loved his shopping list trick with Rie.

• Scandinavian interiors lust: Troels' kitchen looked pretty gorgeous with its dove grey walls and stainless steel appliances, while for those who love a pendant light, The Killing's murder investigation might not be the most important thing on screen. Only the party flat was disappointing with its tapestry wing chairs.

• If Lund doesn't read the files of the missing women soon, I'm going to do it for her.

The American Killing

There is obviously much, much more to say. So get stuck into the comments and add to this – but not spoilers please. British audiences have currently seen up to episode 12, so don't include info from later in the series.

And Tak! everyone. The next blog will be published straight after the programme on Saturday night – drop by and give us your thoughts.

The intricate plot and gritty naturalism of The Killing have had BBC4 and iPlayer viewers enthralled for weeks – and at its heart is detective Sarah Lund, played by Sofie Gråbøl. 'How did I come up with the character?' she asks. 'By acting like a man'